title: Radioimmunoassay of group II pepsinogen in human serum.
abstract: A new radioimmunoassay (RIA) using a double antibody method for human Group II pepsinogens in serum was developed. (1) Sensitivity of this assay system was of the order of 1 microgram per 1 of serum and optimal assay range was 10 to 50 microgram per 1; (2) no effect of interference of human serum was detected and there was no cross-reaction with human Group I pepsinogens within the optimal assay range; (3) satisfactory results were obtained for both within- and between-assay reproducibility (coefficient of variation was 3.9% and 3.7-15.3%, respectively); (4) the mean (+/- SEM) serum Pg II level in healthy donors was 15.9 +/- 0.7 microgram/l for males and 12.8 +/- 1.3 microgram/l for females; the difference between males and females was statistically significant (p less than 0.05); (5) the mean serum Pg II level in 10 patients with total gastrectomy was 1.2 +/- 0.05 microgram/l. These results suggest that most of Pg II in human serum is derived from the gastroduodenal system.
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D000918:Antibody Specificity; D004355:Drug Stability; D005260:Female; D005753:Gastric Mucosa / Q000032:analysis; D006801:Humans; D005779:Immunodiffusion; D008297:Male; D008875:Middle Aged; D010435:Pepsinogens / Q000097:blood* / Q000276:immunology / Q000302:isolation & purification; D011863:Radioimmunoassay / Q000379:methods*; D012016:Reference Values; D012737:Sex Factors
chemical_list: D010435:Pepsinogens